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Why do you think that is a slip ring induction motor? You can clearly see the diodes that are changing the AC to DC to run the motor. That looks like a normal DC motor that they have tapped off of to supply power for the lights. I see nothing to suggest there is no back EMF.

Hi justawatt. I personally am not very knowledgeable about electric motors.

That group is interesting however as they also have a small solid state device which they claim is over unity, and it appears to be self running in their video demos: http://infinitysav.com/freeenergydevice

Although a few of them at least appear to be Russian, for some reason they are based in South Korea.

Here is a link to a motor very similar to the one in the video. You will notice it has the connection box on the side and the covers over the brushes just like the one in the video. The one in the link appears to have a gear reduction unit on the output end but that doesn't change the operation of the motor.

This motor has brushes, and essentially operatesOn two parallel coils.The commutator makes and breaks parallel circuit With the primary coil, to provide motive forceBy the interaction of the two opposing fields.

The diodes at the switch-box, rectify a/c mainsfrom the line in (green digital watt meter)into DC voltage to power the motor.Can’t really see, but it looks like the power stripis also in parallel to the coils.

Because of the inductive drain through the inverter(simplified inverter)There is a power-factor involved.With a solid dc source, you would see current spikeson a scope, every time the commutator switches.

the a/c requires waveform analysis and pfc to determine the ‘actual load’.The new “smart meters” can actually detect this and ifthe meter thinks too much power is inductive ghost-powerit will automatically correct the reading on the meter.

Hi justawatt. I personally am not very knowledgeable about electric motors.

That group is interesting however as they also have a small solid state device which they claim is over unity, and it appears to be self running in their video demos: http://infinitysav.com/freeenergydevice

Although a few of them at least appear to be Russian, for some reason they are based in South Korea.

All the best...

I've seen that infinitsav device before. I recognize two of the circuit boards in the box. One is a DC-DC standard boost converter. The other is a DC-AC inverter that boosts low voltage DC to high voltage AC. The bottom board though appears to be their own design and I assume from the video that shows it alone that is where the magic happens. Interesting circuit if it's real. Unfortunately they don't seem to be selling them yet and are looking for investors